1XMOUNTAINS(1) General Commands Manual XMOUNTAINS(1)
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6 xmountains - A fractal landscape generator.
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9 xmountains [ bqgPdEmMrBnZIASTWFGCapcevfRltxsXYH ]
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13 xmountains is a X11 based fractal landscape generator. It generates
14 random fractal surfaces and displays them in a window. While the pro‐
15 gram is running the fractal is continuously extended on the right and
16 the image is scrolled from right to left to expose the newly generated
17 area.
18 Flags:
21 -b
22 Use the root window.
23 -q
24 Reset the root window when the program exits. This option is
25 ignored unless the program is using the root window.
26 -g [string]
27 Set the geometry of the window.
28 -P [filename]
29 Write the PID to the specified file.
30 -d [string]
31 Set the display.
32 -E
33 Toggle the way that window repainting is done. By default the
34 image pixmap is installed as the background pixmap of the window
35 and window repainting should be performed automatically by the X
36 server. If this does not work on a particular system then this
37 flag can be used to enable explicit expose event processing. In
38 the default mode root window images will remain in place after
39 the program exits.
40 -m
41 Display a map of the surface rather than a perspective view.
42 -M
43 Produce reflections in the water. This may be a little slower.
44 -r [20]
45 To reduce the load on the X server the program generates several
46 columns of pixels before scrolling the image. This flag sets the
47 number of columns. A negative value reverses the direction of
48 scrolling. A value of zero makes the program scan across the
49 window without scrolling at all.
50 -B [80]
51 Set the number of shades of each colour that the program allo‐
52 cates.
53 -n [245]
54 Set a maximum number of colours to use. This is just a different
55 way of setting the number of shades of each colour.
56 -Z [10]
57 Set the number of seconds that the program sleeps after
58 scrolling the screen.
59 -I [40.0]
60 Set the vertical angle of illumination.
61 -A [0.0]
62 Set the horizontal angle of illumination.
63 -S [0.6]
64 Set the vertical stretch of the surface.
65 -T [0.5]
66 Set the vertical shift of the surface.
67 -W [0.5]
68 Set the height where the water occurs.
69 -F [1]
70 Reduce the variation in the foreground height to ensure a good
71 view of the surface. This flag sets the number of iterations for
72 which the foreground height is constrained to a constant value.
73 -G [-1.0]
74 Mean altitude for the for foreground.
75 -C [0.3]
76 Set the contour parameter. The base colour of a point depends on
77 its height and how flat the surface is. This parameter controls
78 the relative importance of these factors.
79 -a [2.5]
80 Set the Altitude of the viewpoint.
81 -p [4.0]
82 Set the distance of the viewpoint from the front of the surface.
83 -c [1.0]
84 Set the contrast parameter. Values too far from 1.0 will give
85 strange results
86 -e [0.3]
87 Set the ambient light level. This is a fractional value that
88 sets how bright shaded areas will be compared to fully illumi‐
89 nated ground.
90 -v [0.6]
91 Set the vertical light level. The program also implements a sec‐
92 ondary light source shining from directly above the surface.
93 This flag sets how bright this light source is relative to the
94 main light source.
95 -f [0.65]
96 Set the fractal dimension of the surface. This should be in the
97 range 0.5-1.0.
98 -R [0]
99 Set the seed for the random number generator. A value of 0
100 causes the seed to be set from the clock.
101 -l [10]
102 Set the width of the surface. Increasing this value by one dou‐
103 bles the width of the surface.
104 -t [2]
105 Set the number of non-fractal iterations. Increasing this value
106 by one doubles the average number of mountains across the width
107 of the surface.
108 -x
109 Use cross updates (see under -H)
110 -s [1]
111 Control the regeneration steps used to reduce creasing. There
112 are three possible regeneration steps controlled by the first 3
113 bits of this flag value. (see under -H)
114 -X [0.0]
115 regeneration step parameter (see under -H)
116 -Y [0.0]
117 regeneration step parameter (see under -H)
118 -H
119 Print a short description of the algorithm explaining the -x -s
120 -X and -Y parameters.
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124 Author: S.Booth@ed.ac.uk
125 XMOUNTAINS(1)